C reading files 🔎

C read a file tutorial example explained
#C #read #file
int main()
{
FILE *pF = fopen("poem.txt", "r");
char buffer[255];
if(pF == NULL)
{
printf("Unable to open file!
");
}
else
{
while(fgets(buffer, 255, pF) != NULL)
{
printf("%s", buffer);
}
}
fclose(pF);
return 0;
}

[@BroCodez]

#include
int main()
{
FILE *pF = fopen("poem.txt", "r");
char buffer[255];
if(pF == NULL)
{
printf("Unable to open file!
");
}
else
{
while(fgets(buffer, 255, pF) != NULL)
{
printf("%s", buffer);
}
}
fclose(pF);
return 0;
}

[@mounikareddy6395]

how can we do it using fscanf?!

[@CorneliusCorndogJr]

your poem was truly the GOAT of all poems and to think you are a code youtuber

[@QuimChaos]

if anyone is getting an error/segmentation fault when testing with a non existent file, move the fclose() inside the else. fclose can't close a file that is not open so it will segment fault...

[@seancantwell12]

Good catch!

[@provokator-provocateur7603]

Best explanation for reading files on youtube!

[@sundude800]

Thank you!! Your channel helps tons!

[@Mukhlisbek]

Very useful
Thank you very much
Hope you will keep making such useful contents

[@salatatoe6812]

Hey man awesome video! Would it be possible if you made a video on registering a word and line number where the word first appears in a dictionary? And then print the words and line numbers.
Have an awesome day!

[@GavinDaGrey]

Your videos are goated, subscribing fs

[@ramiltaghiyev9712]

Roses are red
Violets are blue
This video is awesome
Scooby doo be doo

[@aymanmouhcine5749]

Very helpful playlist
Thank you

[@youssofprogrammer7546]

I love your videos man

[@yorshex]

4:00 why not to just cloes file and return 1 in this if statement?

[@MrDritzii]

Love you bro!

[@itsme-Priyaravi]

This video saved me from a big disaster!!!!
tq so much....

[@Jordan-qi2dn]

I noticed some weird behaviour with this one, what could the case be?
Initially I made a text document with 3 lines, the while loop skipped the first line and printed the remaining 2 no problem.
I edited the file and put the numbers 1-6 on respective lines, and it only printed the even ones. I don't understand why this is happening!

[@MrCEO-jw1vm]

learned a bunch!

[@Andrii87]

nicely done!

[@sodatechtips]

Just a quick message, you do not need != NULL in aloop, since when function fails, an execption is thrown automTically

[@mongraal2272]

thank you very muh!

[@LazaroAchon]

im opening one and i get a bunch of letters

[@yomomlol9808]

will you make a video on fscanf?

[@lord_toker]

What if I want to read from a specific line? Using your file as an example, what would I need to do to make it read just BOOTY BOOTY BOOTY BOOTY in stdout?

[@connerd5295]

if you know the number of which line BOOTY BOOTY BOOTY BOOTY is on, you can make a counter which counts each loop and put the print statement inside an if(counter == the correct line number). then the program wont print any of the other lines in the file.

[@allmyinterests5139]

Very nice explanation thank you so much! I only got one question: your char array consists of 255 chars and you allow fgets() to read 255 characters. But a string always needs \0 at its end so I am used to either declare the string like: char buffer[255 + 1] or read one element less like: fgets(buffer, 254, pF). Isn't that necessary when reading files or was it a mistake in the code? Cheers!

[@seancantwell12]

From ChatGPT:
You're correct. A null-terminator (`\0`) is necessary to mark the end of a C string. If you have an array of 255 characters, reading exactly 255 characters without accounting for the null-terminator can lead to undefined behavior or buffer overflow issues.

[@kayabafoxy0975]

Roses are red
Violets are blue
BOOTY BOOTY BOOTY BOOTY
ROCKIN' EVERYWHERE!

[@wxray2.0]

Thanks bro

[@gerdsfargen6687]

Tried this on a C compiler on an Android. Result is "Segmentation fault/core dumped". What gives?

[@lord_toker]

Android file system =/= Windows file system is my guess

[@BoredTAK5000]

Does anyone know if it'll work in c++?

[@PSIwolf39]

Here's code I made to read a file:
#include
#include
#include
#include
#include
#include
#include
int main(){
FILE *pFile = fopen("C:\\Users\\squee\\Desktop\\Hello.txt","r");
if(pFile == NULL){
printf("Hello.txt does not exist :(");
}
else{
char buffer[256];
while(fgets(buffer,256,pFile) != NULL){
printf("%s",buffer);
}
}
fclose(pFile);
}

[@jazzyBSD]

great, but u don't need all the #includes